NR CSI-RS based beam failure detection/radio link monitoring in FR2
Apparatus and methods are provided for NR CSI-RS based BFD/RLM in FR2. In one novel aspect, BFD in FR2, the evaluation period is extended by the N factor if the CSI-RS for BFD is in a resource set configured with repetition ON or the BFD is performed on CSI-RS#1 without beam information or, where the CSI-RS#1 is configured without beam information if CSI-RS for BFD is not QCL-TypeD with SSB for L1-RSRP beam reporting, nor the CSI-RS for BFD is not QCL-TypeD with CSI-RS for L1-RSRP beam reporting. In one embodiment, the N factor equals to 1 only when at least one predefined RX beam information is included in the RRC configuration. In another embodiment, the predefined RX beam information for BFD is Type-D QCL information for a synchronization signal block (SSB) configured in its TCI state or the CSI-RS#1 is configured with repetition ON.
1. A method comprising:
receiving radio resource control (RRC) configuration by a user equipment (UE) in a wireless network, wherein the RRC configuration includes reference signal (RS) configured in a control resource set (CORESET) active transmission configuration indication (TCI);
determining an evaluation period extending N factor for beam failure detection (BFD) performed on the RS in the configured active TCI of the CORESET for frequency range-2 (FR2) based on the RRC configuration, wherein the N factor equals to 1 only when at least one predefined RX beam information is included in the RRC configuration; and
performing BFD on the configured RS based on the determined N factor.
2. The method of claim 1 , wherein the BFD is performed on the RS in the configured active TCI of the CORESET when a BFD RS is explicitly configured in the RRC configuration.
3. The method of claim 1 , wherein the BFD is performed on the RS in the configured active TCI of the CORESET when there is no BFD RS configured in the RRC configuration.
4. The method of claim 1 , wherein RS is a control state information RS (CSI-RS) in a CSI-RS resource set, and wherein the TCI state of the CSI-RS is configured with Type-D quasi-location (QCL) information.
5. The method of claim 4 , wherein the predefined RX beam information for the CSI-RS is Type-D QCL information and a corresponding synchronization signal block (SSB) configured in the TCI state of the CSI-RS.
6. The method of claim 5 , wherein the SSB is configured for performing layer-1 reference signal received power (L1-RSRP) measurement, wherein L1-RSRP is configured via RRC signaling.
7. The method of claim 4 , wherein the predefined RX beam information for the CSI-RS is another CSI-RS resource in a resource set configured with repetition ON, and wherein N factor equals to 1 when a number of symbols in the CSI-RS resource set is greater than a number of RX beams for the UE.
8. The method of claim 7 , further comprising: performing layer-1 reference signal received power (L1-RSRP) measurement on the CSI-RS resource set, wherein L1-RSRP is configured via RRC signaling.
9. A user equipment (UE), comprising:
a transceiver that transmits and receives radio frequency (RF) signal with a base station in a wireless network;
a configuration receiver that receives radio resource control (RRC) configuration, wherein the RRC configuration includes reference signal (RS) configured in a control resource set (CORESET) active transmission configuration indication (TCI);
a configurator that determines an evaluation period extending N factor for beam failure detection (BFD) performed on the RS in the configured active TCI of the CORESET for frequency range-2 (FR2) based on the RRC configuration, wherein the N factor equals to 1 only when at least one predefined RX beam information is included in the RRC configuration; and
a BFD controller that performs BFD on the configured RS based on the determined N factor.
10. The UE of claim 9 , wherein the BFD is performed on the RS in the configured active TCI of the CORESET when a BFD RS is explicitly configured in the RRC configuration.
11. The UE of claim 9 , wherein the BFD is performed on the RS in the configured active TCI of the CORESET when there is no BFD RS configured in the RRC configuration.
12. The UE of claim 9 , wherein RS is a control state information RS (CSI-RS) in a CSI-RS resource set, and wherein the TCI state of the CSI-RS is configured with Type-D quasi-location (QCL) information.
13. The UE of claim 12 , wherein the predefined RX beam information for the CSI-RS is Type-D QCL information and a corresponding synchronization signal block (SSB) configured in the TCI state of the CSI-RS.
14. The UE of claim 13 , wherein the SSB is configured for performing layer-1 reference signal received power (L1-RSRP) measurement, wherein L1-RSRP is configured via RRC signaling.
15. The UE of claim 12 , wherein the predefined RX beam information for BFD is the CSI-RS resource set is configured with repetition ON, and wherein N factor equals to 1 when a number of symbols in the CSI-RS resource set is greater than a number of RX beams for the UE.
16. The UE of claim 15 , wherein the BFD controller further performs layer-1 reference signal received power (L1-RSRP) measurement on the CSI-RS resource set, wherein L1-RSRP is configured via RRC signaling.